I'm currently doing a Biology essay in college. I am writting about Cholera. the only bit I'am stuck on is the ''Epidemiology (brief)''

I do not have a clueeeee what they mean by this. can somone please help me out into what they mean and how I do this. I have currently written about the cause, how it is transmmited,symptoms, biological explaination of why symptoms occur, treatment and prevention. now I'am on my last bit and I'am stuck..pleeeeeeease help me!

Thanks guys xxxxxxxxxx